/kill

Kills entities (players, mobs, or other entities). If no target is specified, kills the executing entity.

Syntax

/kill [<targets>]

Name	Type	Required	Description
targets	entity	Optional	The entity or entities to kill. Defaults to the executor if omitted.

/kill @e[type=zombie]

Kills all zombie entities in the world.

/kill @e[type=!player]

Kills all entities except players.

/kill @s

Kills the player who runs the command.

Running /kill @e without filtering, this kills ALL entities including players, item frames, armor stands, and dropped items.
Forgetting that killed players drop their inventory unless keepInventory is true.

This command deals max void damage which bypasses resistance, totems, and absorption. Creative mode players can still be killed by this command.

Try these commands on Astroworld or host your own server.